Originally Posted by tolnep
it appears from above that either a) the 2.0 'circle' is the same diameter as the 2.5 cylinder or b) the so-called 'overhang' issue is bogus..
I think the picture shows very well that the chambers are opened up dramatically. There is always a little 'overhang' as you called it. There has to be quench in a daily driven car in order for it to even idle properly. You can see that we opened it up a ton around the valves and on the side of the chamber. We opened it up to the same diameter as a normal 2.5L combustion chamber.